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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Lateral view of a Male Neoleptophlebia mollis (Leptophlebiidae) (Jenny Spinner) Mayfly Dun from the Namekagon River in Wisconsin
Troutnut
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Troutnut on Jul 20, 2006July 20th, 2006, 5:25 pm EDT
I'm not sure why I had this specimen in the Baetidae to begin with. The eyes aren't turbinate and the hind wings are fairly large. I'm going to guess Paraleptophlebia at a glance, but I should come back to this one later. Any thoughts?

It's a pity the pictures are so fuzzy and dust-spotted up close. I took this picture before I really learned how to use and maintain my Canon 20D.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
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Plano, TX

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Taxon on Jul 20, 2006July 20th, 2006, 9:22 pm EDT
Jason-

The claspers certainly look like those of Paraleptophlebia. Have you got a higher resolution photo of the penes? When I blow up the photo that shows them, it distorts too much to see them clearly.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Troutnut
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Troutnut on Jul 21, 2006July 21st, 2006, 1:24 am EDT
Sorry, I don't have a better photo. The sensor resolution isn't the issue on these -- it's the fact that I shot them all at f/32 to get a large depth of field, because at the time I didn't realize how much the diffraction caused by the narrow aperture was spoiling the pictures. The resolution allowed by the lens at that aperture isn't very good.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
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Taxon on Jul 21, 2006July 21st, 2006
Jason-

Likely Paraleptophlebia mollis. See CP VII in Hatches II.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Troutnut
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Troutnut on Jul 22, 2006July 22nd, 2006, 5:36 am EDT
My copy of Hatches II is packed away in boxes like most of the rest of my stuff until August, but the date and general appearance seem right. I don't know how to tell mollis apart from strigula and guttata, which often hatch together with it, but I'll tentatively put this specimen in mollis for now.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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